RCC Structures Design
The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than

24 bar diameters
36 bar diameters
30 bar diameters
18 bar diameters

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RCC Structures Design
A pre-stressed concrete member is preferred because

Large size of long beams carrying large shear force need not be adopted
Removal of cracks in the members due to shrinkage
All listed here
Its dimensions are not decided from the diagonal tensile stress

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